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Enhanced properties of stone coal-based composite phase change materials for thermal energy storage

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International Journal of Minerals,Metallurgy and Materials 2024年第1期31卷 206-215页

作者： baoshan Xie Huan Ma Chuanchang Li Jian Chen Key Laboratory of Renewable Energy Electric-Technology of Hunan Province School of Energy and Power EngineeringChangsha University of Science and TechnologyChangsha 410114China State Key Laboratory of Disaster Prevention and Reduction for Power Grid Changsha University of Science and TechnologyChangsha 410114China

Phase change materials (PCMs) can be incorporated with low-cost minerals to synthesize composites for thermal energy storage in building *** coal (SC) after vanadium extraction treatment shows potential for secondary utilization in composite *** prepared SC-based composite PCMs with SC as a matrix,stearic acid (SA) as a PCM,and expanded graphite (EG) as an *** combined roasting and acid leaching treatment of raw SC was conducted to understand the effect of vanadium extraction on promoting loading *** showed that the combined treatment of roasting at 900℃ and leaching increased the SC loading of the composite by 6.2%by improving the specific surface *** loading capacity and thermal conductivity of the composite obviously increased by 127%and 48.19%,respectively,due to the contribution of 3wt% *** data were supported by the high load of 66.69%and thermal conductivity of 0.59 W·m^(-1)·K-1of the designed *** obtained composite exhibited a phase change temperature of 52.17℃,melting latent heat of 121.5 J·g^(-1),and good chemical *** SC-based composite has prospects in building applications exploiting the secondary utilization of minerals.

关键词： thermal energy storage phase change material stone coal vanadium extraction secondary utilization

Characteristics of the Seismic Waves from a New Active Source Based on Methane Gaseous Detonation

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Earthquake Research in China 2019年第2期33卷 354-366页

作者： wang Weitao wang Xiang MENG Chuanmin DONG Shi wang Zhigang XIE Junju wang baoshan YANG Wei XU Shanhui wang Tao Key Laboratory of Seismic Observation and Geophysical Imaging Institute of GeophysicsCEABeijing 100081China National Key Laboratory of Shock Wave and Detonation Physics Institute of Fluid PhysicsCAEPMianyang 621999SichuanChina Joint Laboratory of High Pressure Physics and Seismology Institute of Fluid PhysicsCAEPMianyang 621999SichuanChina Institute of Geophysics and Geodynamics School of Earth Sciences and EngineeringNanjing UniversityNanjing 210046China School of Earth and Space Sciences University of Science and Technology of ChinaHefei 230026China

Active seismic sources are critical for obtaining high resolution images of the *** active imaging in urban areas,environment friendly and green seismic sources are *** present work,we introduce a new type of green active source based on the gaseous detonation of methane and *** fired in a closed container,the chemical reaction,*** detonation,will produce high pressure air over 150 *** waves are produced when high pressure air is quickly released to impact the *** first field experiment of this active source was carried out in December,2017 in Jingdezhen,Jiangxi Province,where a series of active sources were excited to explore their potential in mine *** current work,we analyzed the seismic waves recorded by near-field accelerators and a dense short-period seismic array and compared them with those from a mobile airgun source,another kind of active source by releasing high pressure air into *** results demonstrate that it can be used for high resolution near surface ***,the gaseous detonation productions are harmless CO2 and water,making it a green explosive ***,the dominant seismic frequencies are 10-80 Hz and a single shot can be recorded up to 15 km,making it suitable for local structure ***,it can be excited in vertical wells,similar to traditional powder explosive *** can also act as an additional on-land active source to airgun sources,which requires a suitable water body as intermediate media to generate repeating ***,the short duration and high frequency signature of the source signals make it safe with no damage to nearby *** make it convenient to excite in urban *** a new explosive source,the excitation equipment and conditions,such as gas ratio,sink depth and air-releasing directions,need further investigation to improve seismic wave generation efficiency.

关键词： Active source Seismic waves Methane detonation source Green seismic source

六氟化硫替代气体绝缘强度的官能团加和理论方法

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高等学校化学学报 2021年第12期42卷 3709-3715页

作者：侯华王宝山武汉大学化学与分子科学学院武汉430072

绝缘强度是设计与发现新型SF6替代气体的关键参数,预测未知气体的绝缘强度通常采用基于量子化学计算建立的构效关系模型,计算过程复杂、误差大、且无法正确描述具有特殊化学键的气体分子.为了能够直观反映绝缘强度随结构的变化规律,提... 详细信息

绝缘强度是设计与发现新型SF6替代气体的关键参数,预测未知气体的绝缘强度通常采用基于量子化学计算建立的构效关系模型,计算过程复杂、误差大、且无法正确描述具有特殊化学键的气体分子.为了能够直观反映绝缘强度随结构的变化规律,提出了官能团加和方法,将分子结构分解为独立的官能团,在一级近似下,将优化后的官能团绝缘强度直接加和,即可获得气体的绝缘强度.与65种已知气体的实验绝缘强度对比,官能团加和方法计算的绝缘强度与实验值相吻合,平均绝对与相对偏差分别为0.0656与6.28%,理论预测值与实验值的相关系数达到0.9879,优于构效关系模型方法.研究结果表明,引入不饱和键或形成环结构,同时避免孤立的CHx,CF等基团,而用CF3,OCF3,SCF3等基团取代,则有利于获得绝缘性能优异的气体分子.

关键词：绝缘强度六氟化硫替代气体官能团加和构效关系模型分子设计

Steam disinfection enhances bioaccessibility of metallic nanoparticles in nano-enabled silicone-rubber baby bottle teats,pacifiers,and teethers

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Journal of Environmental Sciences 2024年第2期136卷 161-171页

作者： Yu Su Binwang Xin Tong Shuchuan Peng Sijin Liu baoshan Xing Rong Ji State Key Laboratory of Pollution Control and Resource Reuse School of the EnvironmentNanjing UniversityNanjing 210023China School of Resources and Environmental Engineering Hefei University of TechnologyHefei 230009China State Key Laboratory of Environmental Chemistry and Ecotoxicology Research Center for Eco-Environmental SciencesChinese Academy of SciencesBeijing 100085China Stockbridge School of Agriculture University of MassachusettsAmherstMA 01003USA

Nano-enabled silicone-rubber articles for feeding or chewing could be a source of metallic nanoparticles(NPs)directly exposed to infants and young ***,the impact of steam disinfection on release of NPs and the related potential risks to children's health are ***,we investigated contents and form of Ag and Zn in 57 nano-enabled silicone-rubber baby bottle teats,pacifiers,and teethers of seven countries and examined the impacts of steam disinfection on in vitro bioaccessibility(IVBA)of Ag and Zn in the *** 89%articles had a mixture of Ag-and Zn-containing NPs and the teethers had relatively high Ag and Zn contents(up to 501 and 254μg/g,respectively).Steam disinfection caused rubber decomposition into micro(nano)plastics(0.54-15.7μm)and NP release from the interior of bulk rubber and micro-sized plastics,thus enhancing the IVBA of Ag and Zn by up to 5.5 *** findings provide insights into mechanisms for NP release by steam *** oral exposure risk assessment suggested low health concerns on individual metal release,our study points out the need to assess the potential health risks of child co-exposure to metallic NPs and micro(nano)plastics.

关键词： Silicone rubber Metallic nanoparticles Micro(nano)plastics Bioaccessibility Children's health

Molecular Dynamics Simulation of Diffusion of Low- molecular-weight Siloxanes in Polydimethylsiloxane

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Molecular Dynamics Simulation of Diffusion of Low- molecular...

DFT/DFTB Calculations of the Electronic Structure and Properties of Some Covalent Organic Frameworks

中国化学会第十二届全国量子化学会议

作者： Xiaojuan Yu baoshan wang College of Chemistry and Molecular Sciences Wuhan University

Migration of low-molecular-weight（LMW）siloxanes from bulk to surface plays a key role in the hydrophobicity recovery mechanism for the polydimethylsiloxane（PDMS）coated *** dynamics simulations were carried out systematically to reveal the microscopic structures and the diffusion behavior of the LMW *** length and weight dependence have been examined ***-square displacement（MSD）analysis shows that the shorter chains prefer to be accumulated into the interfacial region where the LMW siloxanes exhibit much higher diffusion *** of the methyl groups near the PDMS interface were characterized using the order parameter（S）.It was concluded that the interfacial width is around 1nm.

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DFT/DFTB Calculations of the Electronic Structure and Proper...

Experiment and Simulation of Large Capacity Air-guns in Deep Structure Exploration

中国化学会第十二届全国量子化学会议

作者： Hui Hu baoshan wang College of Chemistry and Molecular Sciences Wuhan University

Two-dimentional covalent organic frameworks（COFs）have attracted great interests in many applications such as gas storage/separation,optoelectronics,and ***,the electronic structures of these porous materials are less ***-principles DFT/DFTB methods were employed to reveal the 2D atomic conformations of the tetrathiafulvalene（TTF）/p-diaminobenzene（DAB）,pyrene/DAB,TTF/azine,and pyrene/azine *** was found that the relative stabilization of these structures depends on the orientations of the knot linkages with either parallel or perpendicular ***,the optimized topology of porous crystalline is sensitive to the levels of *** preliminary theoretical work sheds new light on the experimental observations（e.g.,the XRD and electronic features）.

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Earthquake Research in China 2009年第4期23卷 I0001-I0001,373-382页

作者： Tang Jie wang baoshan Ge Hongkui Chen Yong College of Geo-Resources and Information China University of Petroleum Qingdao 266555 China Institute of Geophysics China Earthquake Administration Beijing 100081 China

The air-gun source has important applications as a new, environmentally, green active source in regional scale deep exploration. In the past, the air gun source was used mainly in smallscale, high-resolution shallow oil exploration, but has a lack of adequate research in deep exploration. In order to study the selection of work parameters and field conditions of the air gun source in deep exploration, this paper does the following work：（1） analyze the characteristics of the air gun source using air gun experiments; （2） simulate the air gun signal and air gun-array signal based on the theory of free bubble oscillation to analyze the influence of bubble oscillation and study the wavelet energy and spectrum characteristics needed in deep exploration; （3） on the basis of theoretical simulation, study the influence of work parameters, such as air-gun capacity, work stress and depth on air gun signal and analyze the influence of air-gun array inspired moment and spacing of different air guns on air gun-array signals; and （4） study energy reflection and transmission coefficients for different underwater interfaces, which is very useful for choosing suitable field conditions.

关键词： Air-gun Wavelet simulation Bubble effect Work parameter Field condition

Precise Measurement of Subsurface Seismic Velocity Variation by Coda Wave Interferometry

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Earthquake Research in China 2008年第4期22卷 366-373页

作者： Xia Yu wang baoshan Ge Hongkui Chen Yong Institute of Geology and Geophysics Chinese Aeactemy of Sciences Beijing 1029 China Institute of Geophysics China Earthquake Administration Beijing 100081 China

A filed experiment was conducted continuously for three days,and the velocity variation was measured using coda wave *** measurement error is estimated to be around 10-4,which coincides well with the theoretical *** velocity variation during this period is up to *** relationship between velocity variation and changes in air temperature,barometric pressure and solid earth tide was analyzed with linear least square *** velocity has no dependence on air temperature,but displayed change of the order of 10-6～10-7 when the barometer or earth tide changed one Pa.

关键词： Coda wave interferometry Media property Correlation coefficient Velocity variation

2015年8月12日天津化学爆炸产生的多模式面波分析及其应用研究

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地球物理学报 2020年第11期63卷 4097-4113页

作者：冀战波王宝善中国地震局地球物理研究所北京100081 北京大学地球与空间科学学院北京100871 中国科学技术大学地球与空间科学学院合肥230026

2015年8月12日天津滨海新区发生的强烈化学品爆炸造成了巨大的经济损失和社会影响.天津爆炸产生了清晰的大振幅面波信号,分析结果表明这组信号由基阶和高阶面波组成,可以追踪到约135 km外的远处台站.利用这组面波信号分别开展了以下研究... 详细信息

2015年8月12日天津滨海新区发生的强烈化学品爆炸造成了巨大的经济损失和社会影响.天津爆炸产生了清晰的大振幅面波信号,分析结果表明这组信号由基阶和高阶面波组成,可以追踪到约135 km外的远处台站.利用这组面波信号分别开展了以下研究:(1)利用附近三个台站记录的四个单频基阶Rayleigh波信号对爆破事件的绝对位置进行了网格搜索,结果与利用GPS测量的位置相差仅0.498 km;(2)分别利用网格搜索和主事件定位法,对两次子事件的相对位置进行了确定,距离约75 m左右,与前人研究结果吻合;(3)从面波记录中测量到36条基阶Rayleigh波、49条第一高阶Rayleigh波、9条基阶Love波和29条第一高阶Love波的频散曲线,并进一步反演获得研究区域地下4 km内的S波速度结构.反演结果显示地表处S波速度低至0.375 km·s-1,在小于1 km的浅地表速度梯度较大,符合典型的盆地结构特征.本文的研究结果为类似爆炸等突发事件快速定位提供了新的思路,有助于灾后救援的迅速展开;同时得到天津滨海新区及周边浅层精细的速度结构,对于地震灾害评估有很大帮助.

关键词：天津爆炸多模式面波重定位反演速度结构